Question

A 400-gram sample of a radioactive nuclide is left to decay for 30 hours. At the end of 30 hours, only 200 grams of the sample is left. What is the half-life of the nuclide sample

A) 10 hours
B)1.5 days
C) 30 hours
D) 0.5 hours

Answer 1

Half life means when the sample of a nuclide decreases by half in Mass so half of 400 is 200 grams and it took 30 hours to reach that value thus its the half life of the Sample